Phnom Penh Weather & Climate: Best Time to Visit

The climate in Phnom Penh remains fairly constant, offering very warm temperatures throughout the year. Average maximum daytime temperatures range from a very hot 37°C (99°F) in April, the warmest time of the year, to a very warm 33°C (91°F) during cooler months like December.

At night, you can expect temperatures ranging from 27°C (81°F) in April to around 23°C (73°F) during December.

Check out our detailed temperature page for more information.

Temperature ranges by month

Phnom Penh is known for its substantial rainfall, with annual precipitation reaching 1415 mm (56 in). Significant seasonal changes in precipitation occur throughout the year. In the wettest month, September it receives heavy rainfall, averaging 252 mm (9.9 in) of precipitation, recorded across 19 rainy days. In contrast, the driest month February brings less rainfall, with 12 mm (0.5 in) over 2 rainy days. For more details, please visit our Phnom Penh Precipitation page.

The mean monthly precipitation over the year, including rain, hail, and snow

The average number of days each month with precipitation

Seasonal changes in sunshine hours are quite dramatic in Phnom Penh. While March receives considerable daily sunshine with up to 9.0 hours, September marks the darkest time of the year, where sunshine is scarce with only 4.3 hours of sunlight per day.

Visit our detailed sunshine hours page for more information.

Monthly hours of sunshine

Daily hours of sunshine

The relative humidity is high throughout the year in Phnom Penh.

The city experiences its highest humidity in September, reaching 84%. In February, the humidity drops to its lowest level at 71%. What does this mean? Read our detailed page on humidity levels for further details.

Relative humidity over the year

The mean wind speed varies between 2 m/s (4 knots) and 3 m/s (6 knots) throughout the year. It is lowest in January, February, May, September and October and highest during March, April, June, July, August, November and December. What does this mean?

The mean monthly wind speed over the year (meters per second)